Spinner component usage _android of Android programming development

This example describes the spinner component usage of Android programming. Share to everyone for your reference, specific as follows:

The spinner component group uses an adapter adapter to display a Drop-down list, and the following is an example of how the component is used

The first is the layout file Main.xml:

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= 
"http://schemas.android.com/apk/" Res/android " 
 android:orientation=" vertical "android:layout_width=" fill_parent " 
 android:layout_height=" Fill_parent "> 
 <spinner android:id=" @+id/spinner1 android:layout_width= "Fill_parent" 
  android: layout_height= "Wrap_content"/> <spinner android:id= "@+id/spinner2" android:layout_width= "Fill_parent" 
  android:layout_height= "wrap_content" android:layout_margintop= "20DP"/>
</LinearLayout> 

Because Simpadapter is used, the layout of the item to be written is as follows Item.xml:

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= 
"http://schemas.android.com/apk/" Res/android " 
 android:orientation=" Horizontal "android:layout_width=" fill_parent " 
 android:layout_height=" "Wrap_content" > 
 <imageview android:id= "@+id/ivlogo" android:layout_width= "60DP" 
  android:layout_ height= "60DP" android:src= "@drawable/icon" 
  android:paddingleft= "10DP"/> "<textview android:id= 
 " @+id /tvapplicationname "android:textcolor=" #000 " 
  android:layout_width=" wrap_content "android:layout_height=" fill _parent " 
  android:textsize=" 16DP "android:gravity=" center_vertical " 
  android:paddingleft=" 10DP "/> 
</LinearLayout> 

Here's the code:

Import java.util.ArrayList; 
Import Java.util.HashMap; 
Import java.util.List; 
Import Java.util.Map; 
Import android.app.Activity; 
Import Android.app.AlertDialog; 
Import Android.os.Bundle; 
Import Android.view.View; 
Import Android.widget.AdapterView; 
Import Android.widget.ArrayAdapter; 
Import Android.widget.SimpleAdapter; 
Import Android.widget.Spinner; 
Import Android.widget.AdapterView.OnItemSelectedListener; public class Main extends activity {@Override the public void OnCreate (Bundle savedinstancestate) {super.oncreate ( 
  Savedinstancestate); 
  Setcontentview (R.layout.main); 
  Gets the object Spinner spinner1 = (Spinner) Findviewbyid (r.id.spinner1); 
  string[] Applicationnames = new string[] {"Multifunction Calendar", "Eoemarket client", "play-resistant gravity block", "White Society", "program Terminator"}; arrayadapter<string> aaadapter = new Arrayadapter<string> (this, Android. 
  R.layout.simple_spinner_item, Applicationnames); Use the following code to bring the list items to the RadioButton component//Aaadapter.setdropdownviewresource (Android. R.laYout.simple_spinner_dropdown_item); 
  Spinner1.setadapter (Aaadapter); 
  Spinner Spinner2 = (Spinner) Findviewbyid (R.ID.SPINNER2); 
  Final list<map<string, object>> items = new arraylist<map<string, object>> (); 
  map<string, object> item1 = new hashmap<string, object> (); 
  Item1.put ("Ivlogo", R.drawable.calendar); 
  Item1.put ("Tvapplicationname", "multi-functional calendar"); 
  map<string, object> item2 = new hashmap<string, object> (); 
  Item2.put ("Ivlogo", R.drawable.eoemarket); 
  Item2.put ("Tvapplicationname", "Eoemarket client"); 
  Items.Add (ITEM1); 
  Items.Add (ITEM2); Simpleadapter simpleadapter = new Simpleadapter (this, items, R.layout.item, new string[] {"Ivlogo", "Tvapplicat 
  Ionname "}, new int[] {R.id.ivlogo, r.id.tvapplicationname}); 
  Spinner2.setadapter (Simpleadapter); Spinner2 Plus Listener Event Spinner2.setonitemselectedlistener (new Onitemselectedlistener () {@Override public void on Itemselected (adapterview<?> Parent, view view, int position, long ID) {New Alertdialog.builder (View.getcontext ()). Settitle ( Items.get (position). Get ("Tvapplicationname"). ToString ()). SetIcon (Integer.parseint items.get (positi 
   ON). Get (' Ivlogo '). toString ()). Show (); 
 @Override public void onnothingselected (adapterview<?> parent) {}});

 } 
}

I hope this article will help you with your Android programming.